{"product_id":"yoshimura-rs-4-premium-muffler-repack-kit-repack-rs4-adv","title":"Yoshimura RS-4 Premium Muffler Repack Kit – REPACK-RS4-ADV","description":"\u003cdiv class=\"trd trd--yoshimura\"\u003e\n\u003csection class=\"trd-hero\"\u003e\u003cp class=\"trd-eyebrow\"\u003eYoshimura · RS-4\u003c\/p\u003e\n\u003ch2 class=\"trd-headline\"\u003eYoshimura RS-4 Premium Muffler Repack Kit\u003c\/h2\u003e\n\u003cp class=\"trd-lead\"\u003eThe Yoshimura RS-4 Premium Muffler Repack Kit is a replacement service parts package designed to refresh RS-4 off-road mufflers so they continue to operate as intended. Yoshimura notes that off-road systems should be repacked after 6-8 hours of use, or after each Race, to help maintain proper exhaust function.\u003c\/p\u003e\n\u003cp class=\"trd-lead\"\u003eBy replacing dirty packing that can restrict airflow, this kit supports freer airflow from the motor, helping restore lost power and improve exhaust sound as the manufacturer describes. See the fitment table below for the specific GasGas, Honda, KTM, Suzuki, and Yamaha models and model years supported.\u003c\/p\u003e\n\u003cul class=\"trd-chips\"\u003e\n\u003cli class=\"trd-chip\"\u003e\n\u003cspan class=\"trd-chip-label\"\u003ePart Number\u003c\/span\u003e\u003cspan class=\"trd-chip-value\"\u003eREPACK-RS4-ADV\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli class=\"trd-chip\"\u003e\n\u003cspan class=\"trd-chip-label\"\u003eSeries\u003c\/span\u003e\u003cspan class=\"trd-chip-value\"\u003eRS-4\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli class=\"trd-chip\"\u003e\n\u003cspan class=\"trd-chip-label\"\u003eFits\u003c\/span\u003e\u003cspan class=\"trd-chip-value\"\u003eGasGas EX-250F \/ EX-350F \/ MC-250F \/ MC-350F \/ MC-450F; Honda CRF250L \/ CRF250L-Rally \/ CRF450R \/ CRF450X; KTM 350EXC-F \/ 350SX-F \/ 450SX-F \/ 450SX-F-FACTORY-EDITION \/ 450XC-F \/ 450XC-W \/ 500EXC \/ 500XC-W; Suzuki RM-Z250 \/ RM-Z450 \/ RMX450Z; Yamaha WR250F \/ WR250R \/ WR450F \/ YZ250F \/ YZ250FX \/ YZ450F\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/section\u003e\u003cdiv class=\"trd-cards trd-cards--3\"\u003e\n\u003carticle class=\"trd-card\"\u003e\u003cdiv class=\"trd-card-body\"\u003e\n\u003ch3 class=\"trd-card-title\"\u003eSilent Sport packing included\u003c\/h3\u003e\n\u003cp class=\"trd-card-text\"\u003eThis kit includes Yoshimura Silent Sport Premium Packing Material to replace worn or contaminated muffler packing. Yoshimura explains that dirty packing can restrict airflow from the motor, contributing to a loss of power and degradation of sound, making timely repacks an important part of routine off-road exhaust service.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/article\u003e\u003carticle class=\"trd-card\"\u003e\u003cdiv class=\"trd-card-body\"\u003e\n\u003ch3 class=\"trd-card-title\"\u003eRS-4 appearance refresh\u003c\/h3\u003e\n\u003cp class=\"trd-card-text\"\u003eAlong with packing, the kit includes RS-4 identification pieces to update the look of the canister after service. Contents include an RS-4 End-cap and Canister Decal (RS4-NB003 \u0026amp; RS4-NB004 x 1 QTY) plus an RS-4 Badge (RS4-NB001 x 1 QTY).\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/article\u003e\u003carticle class=\"trd-card\"\u003e\u003cdiv class=\"trd-card-body\"\u003e\n\u003ch3 class=\"trd-card-title\"\u003eService hardware provided\u003c\/h3\u003e\n\u003cp class=\"trd-card-text\"\u003eThe kit includes key hardware intended for the repack process: Rivet Band (LC4.5T x 2 QTY) and Stainless Rivet (C3-RIVET x 8 QTY). With these components in the box, it supports a more complete service of a Yoshimura RS-4 muffler during scheduled maintenance.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/article\u003e\n\u003c\/div\u003e\n\u003csection class=\"trd-story trd-story--text\"\u003e\u003cdiv class=\"trd-story-copy\"\u003e\n\u003cp class=\"trd-label\"\u003ePerformance\u003c\/p\u003e\n\u003ch3 class=\"trd-story-title\"\u003eWhy repacking matters\u003c\/h3\u003e\n\u003cp class=\"trd-story-text\"\u003eYoshimura emphasizes that repacking at the suggested intervals is essential for an exhaust to perform the way it was designed. The manufacturer states that off-road systems need to be repacked after 6-8 hours of use, or after each Race. As packing gets dirty, it can restrict airflow from the motor, resulting in a loss of power and degradation of sound.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e\u003csection class=\"trd-story trd-story--text\"\u003e\u003cdiv class=\"trd-story-copy\"\u003e\n\u003cp class=\"trd-label\"\u003eSound\u003c\/p\u003e\n\u003ch3 class=\"trd-story-title\"\u003eRestore airflow and sound\u003c\/h3\u003e\n\u003cp class=\"trd-story-text\"\u003eAccording to Yoshimura, repacking the muffler allows for freer airflow from the motor, which restores lost power and improves the exhaust sound. This RS-4 Premium Muffler Repack Kit is built around that maintenance goal, providing the packing material along with related RS-4 decals, badge, and included rivet bands and rivets listed in the product contents.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e\u003csection class=\"trd-story trd-story--text\"\u003e\u003cdiv class=\"trd-story-copy\"\u003e\n\u003cp class=\"trd-label\"\u003eFitment\u003c\/p\u003e\n\u003ch3 class=\"trd-story-title\"\u003eFitment and installation\u003c\/h3\u003e\n\u003cp class=\"trd-story-text\"\u003eThis repack kit is specified for a range of GasGas, Honda, KTM, Suzuki, and Yamaha applications as listed in the fitment table. An installation PDF is provided on the page for reference during service, helping ensure the repack process follows the intended steps for the RS-4 series.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e\u003csection class=\"trd-section trd-section--specs\"\u003e\u003ch2 class=\"trd-section-title\"\u003eSpecifications\u003c\/h2\u003e\n\u003cdiv class=\"trd-table-wrap\"\u003e\u003ctable class=\"trd-table trd-table--specs\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003ePart Number\u003c\/th\u003e\n\u003ctd\u003eREPACK-RS4-ADV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eYoshimura\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eProduct Line\u003c\/th\u003e\n\u003ctd\u003eReplacement Service Parts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eSeries\u003c\/th\u003e\n\u003ctd\u003eRS-4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eShipping Weight\u003c\/th\u003e\n\u003ctd\u003e1 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eBarcode\u003c\/th\u003e\n\u003ctd\u003e00840025913776\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003c\/div\u003e\u003c\/section\u003e\u003csection class=\"trd-section trd-section--fitment\"\u003e\u003ch2 class=\"trd-section-title\"\u003eFitment\u003c\/h2\u003e\n\u003cdiv class=\"trd-table-wrap\"\u003e\u003ctable class=\"trd-table\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth scope=\"col\"\u003eMake\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eModel\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eModel Years\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eGasGas\u003c\/td\u003e\n\u003ctd\u003eEX-250F\u003c\/td\u003e\n\u003ctd\u003e2023\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGasGas\u003c\/td\u003e\n\u003ctd\u003eEX-350F\u003c\/td\u003e\n\u003ctd\u003e2021–2023\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGasGas\u003c\/td\u003e\n\u003ctd\u003eMC-250F\u003c\/td\u003e\n\u003ctd\u003e2021–2023\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGasGas\u003c\/td\u003e\n\u003ctd\u003eMC-350F\u003c\/td\u003e\n\u003ctd\u003e2022–2023\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGasGas\u003c\/td\u003e\n\u003ctd\u003eMC-450F\u003c\/td\u003e\n\u003ctd\u003e2022–2023\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHonda\u003c\/td\u003e\n\u003ctd\u003eCRF250L\u003c\/td\u003e\n\u003ctd\u003e2013–2020\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHonda\u003c\/td\u003e\n\u003ctd\u003eCRF250L-Rally\u003c\/td\u003e\n\u003ctd\u003e2017–2020\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHonda\u003c\/td\u003e\n\u003ctd\u003eCRF450R\u003c\/td\u003e\n\u003ctd\u003e2011–2012\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHonda\u003c\/td\u003e\n\u003ctd\u003eCRF450X\u003c\/td\u003e\n\u003ctd\u003e2019–2026\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKTM\u003c\/td\u003e\n\u003ctd\u003e350EXC-F\u003c\/td\u003e\n\u003ctd\u003e2011–2015\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKTM\u003c\/td\u003e\n\u003ctd\u003e350SX-F\u003c\/td\u003e\n\u003ctd\u003e2011–2015\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKTM\u003c\/td\u003e\n\u003ctd\u003e450SX-F\u003c\/td\u003e\n\u003ctd\u003e2012–2014, 2019–2020\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKTM\u003c\/td\u003e\n\u003ctd\u003e450SX-F-FACTORY-EDITION\u003c\/td\u003e\n\u003ctd\u003e2012–2014\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKTM\u003c\/td\u003e\n\u003ctd\u003e450XC-F\u003c\/td\u003e\n\u003ctd\u003e2013–2015, 2020\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKTM\u003c\/td\u003e\n\u003ctd\u003e450XC-W\u003c\/td\u003e\n\u003ctd\u003e2012–2015\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKTM\u003c\/td\u003e\n\u003ctd\u003e500EXC\u003c\/td\u003e\n\u003ctd\u003e2012–2015\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKTM\u003c\/td\u003e\n\u003ctd\u003e500XC-W\u003c\/td\u003e\n\u003ctd\u003e2012–2015\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSuzuki\u003c\/td\u003e\n\u003ctd\u003eRM-Z250\u003c\/td\u003e\n\u003ctd\u003e2010–2018\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSuzuki\u003c\/td\u003e\n\u003ctd\u003eRM-Z450\u003c\/td\u003e\n\u003ctd\u003e2008–2017\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSuzuki\u003c\/td\u003e\n\u003ctd\u003eRMX450Z\u003c\/td\u003e\n\u003ctd\u003e2010–2011\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eWR250F\u003c\/td\u003e\n\u003ctd\u003e2023\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eWR250R\u003c\/td\u003e\n\u003ctd\u003e2008–2020\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eWR450F\u003c\/td\u003e\n\u003ctd\u003e2012–2014\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eYZ250F\u003c\/td\u003e\n\u003ctd\u003e2007–2017, 2024–2026\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eYZ250FX\u003c\/td\u003e\n\u003ctd\u003e2015\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eYZ450F\u003c\/td\u003e\n\u003ctd\u003e2010–2013\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cp class=\"trd-caption\"\u003eFitment as listed by Yoshimura for part number REPACK-RS4-ADV.\u003c\/p\u003e\u003c\/section\u003e\u003csection class=\"trd-section trd-section--docs\"\u003e\u003ch2 class=\"trd-section-title\"\u003eInstallation \u0026amp; Documents\u003c\/h2\u003e\n\u003cp class=\"trd-docs\"\u003e\u003ca class=\"trd-button\" href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0585\/4884\/6743\/files\/yoshimura-repack-rs4-adv-installation-manual.pdf?v=1792278836\" target=\"_blank\" rel=\"noopener\"\u003eInstructions \/ What's Included (PDF)\u003c\/a\u003e\u003c\/p\u003e\n\u003cp class=\"trd-caption\"\u003eProvided by Yoshimura. Opens in a new tab.\u003c\/p\u003e\u003c\/section\u003e\n\u003c\/div\u003e","brand":"Yoshimura","offers":[{"title":"Default Title","offer_id":68080827859095,"sku":"REPACK-RS4-ADV","price":78.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0585\/4884\/6743\/files\/yoshimura-repack-rs4-adv-rs4-main.jpg?v=1792278840","url":"https:\/\/allamericanktm.com\/products\/yoshimura-rs-4-premium-muffler-repack-kit-repack-rs4-adv","provider":"All American KTM","version":"1.0","type":"link"}